<template>
  <div class="upload-container">
    <el-button :style="{background:color,borderColor:color}" icon="el-icon-upload" size="mini" type="primary" round @click=" dialogVisible=true">选择图片
    </el-button>
    <el-dialog :visible.sync="dialogVisible">
      <el-upload
        action="''"
        multiple
        list-type="picture-card"
        :http-request="upload"
        :on-success="handleSuccess"
        :before-upload="beforeAvatarUpload"
      >
        <el-button size="small" type="primary" round>本地选择图片</el-button>
      </el-upload>
      <div class="tac mgt30">
        <el-button type="primary submit" round size="mini" @click="handleSubmit">确认提交</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>

import { createId } from '@/utils/index' // 一个生产唯一的id的方法
import OSS from 'ali-oss'
import { selectOSSInfo } from '@/api/set/oss'
export default {
  name: 'EditorSlideUpload',
  props: {
    color: {
      type: String,
      default: '#1890ff'
    }
  },
  data() {
    return {
      dialogVisible: false,
      listObj: [],
      fileList: [],
      uploadParams: {
        uploadPath: '',
        uploadSize: ''
      },
      dialogImageUrl: '',
      imageUrl: '',
      filePath: '',
      batchList: [],
      tempArr: [],
      ossData: {
        region: '', // 服务器集群地区
        accessKeyId: '', // OSS帐号
        accessKeySecret: '', // OSS 密码
        bucket: ''// 阿里云上存储的 Bucket
      }
    }
  },
  created() {
    selectOSSInfo().then(res => {
      if (res.code === 1) {
        // res.data=JSON.parse(this.$base64.decode(res.data));
        this.ossData.region = res.data.oss_region
        this.ossData.accessKeyId = res.data.oss_accessKeyId
        this.ossData.accessKeySecret = res.data.oss_accessKeySecret
        this.ossData.bucket = res.data.oss_backetName
      }
    })
  },
  methods: {
    handleSubmit() {
      const arr = Object.keys(this.listObj).map(v => this.listObj[v])
      this.$emit('successCBK', arr)
      this.listObj = []
      this.fileList = []
      this.dialogVisible = false
    },
    // 图片上传前验证
    beforeAvatarUpload(file) {
      // file.size / 1024 图片的大小
      const format = /^image\/(jpeg|png|gif|bmp|jpg)$/.test(file.type)
      const isLt1M = file.size / 1024 / 1024 < 1
      this.uploadParams.uploadSize = file.size
      if (!format) {
        this.$message.error('上传图片只能是 JPG，PNG，GIF格式!')
      }
      if (!isLt1M) {
        this.$message.error('上传图片大小不能超过 1MB!')
      }
      return format && isLt1M
    },
    // 上传图片到OSS 同时派发一个事件给父组件监听
    upload(item) {
      let type
      const client = new OSS({
        region: this.ossData.region,
        accessKeyId: this.ossData.accessKeyId,
        accessKeySecret: this.ossData.accessKeySecret,
        bucket: this.ossData.bucket
      })
      switch (item.file.type) {
        case 'image/jpeg': {
          type = 'jpeg'
        } break
        case 'image/jpg': {
          type = 'jpg'
        } break
        case 'image/gif': {
          type = 'gif'
        } break
        case 'image/png': {
          type = 'png'
        } break
      }
      this.batchList.push({
        name: item.file.name,
        url: ''
      })
      this.tempArr.push({
        name: item.file.name,
        url: ''
      })
      const key = 'BCenter/time=' + new Date().getTime() + '&id=' + this.guidGenerator() + '.' + type// 存储路径，并且给图片改成唯一名字
      return client.put(key, item.file).then(res => { // OSS上传
        const url = res.url
        this.uploadParams.uploadPath = client.signatureUrl(key, { expires: 999999999999999 }) // 可访问的链接
        this.batchList.push({
          name: item.file.name,
          url: this.uploadParams.uploadPath
        })
        this.batchList = this.batchList.slice(this.batchList.length / 2, this.batchList.length)
        // this.$refs.upload.submit()
      })
    },
    guidGenerator() {
      var S4 = function() {
        return ((1 + Math.random()) * 0X10000 | 0).toString(16).substring(1)
      }
      return (S4() + S4() + "-" + S4() + "-" + S4() + "-" + S4() + "-" + S4() + S4() + S4())
    },
    handleSuccess(res, file) {
      this.filePath = URL.createObjectURL(file.raw)
      this.fileList = []
      for (var i = 0; i < this.batchList.length; i++) {
        for (var j = 0; j < this.tempArr.length; j++) {
          if (this.tempArr[j].name == this.batchList[i].name) {
            this.tempArr[j].url = this.batchList[i].url
          }
        }
      }
      for (var k = 0; k < this.tempArr.length; k++) {
        this.listObj[k] = this.tempArr[k].url
      }
    },
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url
      this.dialogVisible = true
    }

  }
}
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
.editor-slide-upload {
  margin-bottom: 20px;
  /deep/ .el-upload--picture-card {
    width: 100%;
  }
}
</style>
